a priori

[ey prahy-awr-ahy, -ohr-ahy, ey pree-awr-ee, -ohr-ee, ah pree-awr-ee, -ohr-ee]
from a general law to a particular instance; valid independently of observation. Compare a posteriori ( def 1 ).
existing in the mind prior to and independent of experience, as a faculty or character trait. Compare a posteriori ( def 2 ).
not based on prior study or examination; nonanalytic: an a priori judgment.

1645–55; < Latin: literally, from the one before. See a-4, prior

apriority [ey-prahy-awr-i-tee, -or-] , noun

ad hoc, a posteriori, a priori, ex post facto, prima facie.
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World English Dictionary
a priori (eɪ praɪˈɔːraɪ, ɑː prɪˈɔːrɪ)
1.  logic relating to or involving deductive reasoning from a general principle to the expected facts or effects
2.  logic known to be true independently of or in advance of experience of the subject matter; requiring no evidence for its validation or support
3.  statistics prior probability See mathematical probability
[C18: from Latin, literally: from the previous (that is, from cause to effect)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

a priori
1710, "from cause to effect" (a logical term, in ref. to reasoning), from L., lit. "from what comes first," from priori, abl. of prior "first" (see prior (adj.)). Used loosely for "in accordance with previous knowledge" (1834).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Now, let me say that I have a priori suspicions, prejudices mainly.
But this isn't a book you buy for the a priori dissection.
There exists only one class of aggregation devices which do not require a
  priori privileging of some preferences.
We do not want the Bulletin's editorials to degenerate into a mere repetition
  of commonly held, but erroneous, a priori notions.
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